Air permeability measurement with online porosity sensor

Uncover real-time fluctuations to stabilize the process and maximize roll quality

Online air permeability measurements give the porosity of paper on the machine, acting as an early warning system to process variability as well as the effects of process and raw material changes.

ACA Permi™ provides online porosity measurements to uncover real-time fluctuations so mills can stabilize the process and maximize roll quality. 
ABB has partnered with ACA to provide our customers with market-leading, proven technology for online porosity measurement. Using a continuous air flow method, the ACA Permi provides measurement 50-100 times faster than any other system on the market. With real-time measurement data for each reel produced, mills get a sophisticated analysis of permeability variations to optimize raw materials, energy usage and quality. 

Payback in weeks

Customers have reported up to 50 percent faster grade change times when controlling the reel quality with ACA Permi. Because grade change time equates to a loss of production, ACA Permi helps minimize downtime and maximize ROI. 


• Fast results for optimum loop control options
• Quicker grade changes with real-time sensor information
• Improved runnability and production
• Low cost of ownership
• Better product quality
• Reduced energy and raw material use

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Measuring heads provide extra functionality, reliability and accuracy

Different sizes provide optimum measuring range, accuracy and grade independency.

  • Multiple tailored measuring heads with special coatings for challenging applications

  • Excellent contact with the web to eliminate the leakage of air, dust and other disturbances.

  • Special coatings: Avoiding markings, extreme wear or provide durable low friction.

Optional dust removal ring for extra cleaning performance, especially for applications like sack, filter or cigarette papers

Integration with ABB's Quality Control System

The porosity measurement can also be integrated as an input to the ABB QCS800xA system. This allows for the control of a wide range of process variables, including refining energy, chemical addition and furnish mix. As a result, customers can reduce material and energy costs while maintaining critical quality parameters. It can also be used within ABB’s virtual measurement applications and other advanced control techniques.
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Following the pioneering spirit made famous in the lab paper testing industry by the Lorentzen & Wettre, ABB brings the latest modern conveniences and enhancements in our fully updated L&W Tearing Tester. 

It offers mills the best features for automation, digitalization, and operator safety, providing an easy-to-use system with accurate and repeatable results. 

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